How to Replace a Battery on a Honeywell AC Wall Unit

Honeywell manufactures many types of home thermostats, from analogue models to digital programmable ones. Digital models require two double-A batteries, which allow the thermostat to save your settings, and retain your settings in the event of a power outage. After an extended period of time, the batteries will die, and must be replaced to resume operation of the thermostat. The batteries are located on the thermostat itself and are designed to be replaced by the homeowner.

Things You'll Need

• 2 AA alkaline batteries
• Coin

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Instructions

1. • 1

     Move the thermostat mode switch to the "Off" position to turn off the thermostat, even if it is not functioning due to dead batteries.

   • 2

     Insert a coin into the slot on the coin slot on the bottom-left side of the thermostat. Pry the battery cover off the thermostat.

   • 3

     Pull the batteries out of the thermostat, and then install the new ones. Ensure that the batteries are installed at the proper orientation, as indicated in the diagram below the battery compartment.

   • 4

     Snap the battery cover back onto the thermostat.

   • 5

     Move the thermostat mode switch back to the desired setting.